yeah I tried it out in an early set 11 file to clear my graveyard for when Naraves hit the field. Remember, all characters are units, but not all units are characters. Unless it specifically mentions it (e.g. Sumer's skills) "units" always include characters in the effect

[shameless link] I can still claim I'm a free player cause I haven't spent any of my money on the game, but instead I used Prizerebel to get my EX packs. Gran Train = viewtopic.php?f=13&t=11761[/shameless link]

Yep, all characters are units but not all units are characters. You know, maybe as part of my plan to make everything more intuitive and better, I should change that. My only fear is haaving to change every single "do damage AT to one random enemy unit" would have to be "do damage AT to one random enemy unit or character"